return type will be needed. Sorting by type might be useful then.
But if parameters are different then sorting by parameter list will make subsequent sorting by return type pointless.
But your evidence argument is plain spurious, just because something is not done, its not evidence that it would not be useful
I didn't say not useful, I said not salient, and I actually meant that it is not typically what the user is looking for as the first criteria. It is evidence, because someone did think about it when they wrote the code. You are welcome to dispute the quality of the evidence.